/*
 Copyright 2011-2013 Abdulla Abdurakhmanov
 Original sources are available at https://code.google.com/p/x2js/

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
/* eslint-disable */

export default class X2JS {
  constructor(config) {
    var VERSION = '1.2.0';

    config = config || {};
    initConfigDefaults();
    initRequiredPolyfills();

    function initConfigDefaults() {
      if (config.escapeMode === undefined) {
        config.escapeMode = true;
      }

      config.attributePrefix = config.attributePrefix || '_';
      config.arrayAccessForm = config.arrayAccessForm || 'none';
      config.emptyNodeForm = config.emptyNodeForm || 'text';

      if (config.enableToStringFunc === undefined) {
        config.enableToStringFunc = true;
      }
      config.arrayAccessFormPaths = config.arrayAccessFormPaths || [];
      if (config.skipEmptyTextNodesForObj === undefined) {
        config.skipEmptyTextNodesForObj = true;
      }
      if (config.stripWhitespaces === undefined) {
        config.stripWhitespaces = true;
      }
      config.datetimeAccessFormPaths = config.datetimeAccessFormPaths || [];

      if (config.useDoubleQuotes === undefined) {
        config.useDoubleQuotes = false;
      }

      config.xmlElementsFilter = config.xmlElementsFilter || [];
      config.jsonPropertiesFilter = config.jsonPropertiesFilter || [];

      if (config.keepCData === undefined) {
        config.keepCData = false;
      }
    }

    var DOMNodeTypes = {
      ELEMENT_NODE: 1,
      TEXT_NODE: 3,
      CDATA_SECTION_NODE: 4,
      COMMENT_NODE: 8,
      DOCUMENT_NODE: 9,
    };

    function initRequiredPolyfills() {}

    function getNodeLocalName(node) {
      var nodeLocalName = node.localName;
      if (nodeLocalName == null)
        // Yeah, this is IE!!
        nodeLocalName = node.baseName;
      if (nodeLocalName == null || nodeLocalName == '')
        // =="" is IE too
        nodeLocalName = node.nodeName;
      return nodeLocalName;
    }

    function getNodePrefix(node) {
      return node.prefix;
    }

    function escapeXmlChars(str) {
      if (typeof str == 'string')
        return str
          .replace(/&/g, '&amp;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;')
          .replace(/"/g, '&quot;')
          .replace(/'/g, '&apos;');
      else return str;
    }

    function unescapeXmlChars(str) {
      return str
        .replace(/&lt;/g, '<')
        .replace(/&gt;/g, '>')
        .replace(/&quot;/g, '"')
        .replace(/&apos;/g, "'")
        .replace(/&amp;/g, '&');
    }

    function checkInStdFiltersArrayForm(stdFiltersArrayForm, obj, name, path) {
      var idx = 0;
      for (; idx < stdFiltersArrayForm.length; idx++) {
        var filterPath = stdFiltersArrayForm[idx];
        if (typeof filterPath === 'string') {
          if (filterPath == path) break;
        } else if (filterPath instanceof RegExp) {
          if (filterPath.test(path)) break;
        } else if (typeof filterPath === 'function') {
          if (filterPath(obj, name, path)) break;
        }
      }
      return idx != stdFiltersArrayForm.length;
    }

    function toArrayAccessForm(obj, childName, path) {
      switch (config.arrayAccessForm) {
        case 'property':
          if (!(obj[childName] instanceof Array)) obj[childName + '_asArray'] = [obj[childName]];
          else obj[childName + '_asArray'] = obj[childName];
          break;
        /*case "none":
					break;*/
      }

      if (!(obj[childName] instanceof Array) && config.arrayAccessFormPaths.length > 0) {
        if (checkInStdFiltersArrayForm(config.arrayAccessFormPaths, obj, childName, path)) {
          obj[childName] = [obj[childName]];
        }
      }
    }

    function fromXmlDateTime(prop) {
      // Implementation based up on http://stackoverflow.com/questions/8178598/xml-datetime-to-javascript-date-object
      // Improved to support full spec and optional parts
      var bits = prop.split(/[-T:+Z]/g);

      var d = new Date(bits[0], bits[1] - 1, bits[2]);
      var secondBits = bits[5].split('.');
      d.setHours(bits[3], bits[4], secondBits[0]);
      if (secondBits.length > 1) d.setMilliseconds(secondBits[1]);

      // Get supplied time zone offset in minutes
      if (bits[6] && bits[7]) {
        var offsetMinutes = bits[6] * 60 + Number(bits[7]);
        var sign = /\d\d-\d\d:\d\d$/.test(prop) ? '-' : '+';

        // Apply the sign
        offsetMinutes = 0 + (sign == '-' ? -1 * offsetMinutes : offsetMinutes);

        // Apply offset and local timezone
        d.setMinutes(d.getMinutes() - offsetMinutes - d.getTimezoneOffset());
      } else if (prop.indexOf('Z', prop.length - 1) !== -1) {
        d = new Date(
          Date.UTC(
            d.getFullYear(),
            d.getMonth(),
            d.getDate(),
            d.getHours(),
            d.getMinutes(),
            d.getSeconds(),
            d.getMilliseconds()
          )
        );
      }

      // d is now a local time equivalent to the supplied time
      return d;
    }

    function checkFromXmlDateTimePaths(value, childName, fullPath) {
      if (config.datetimeAccessFormPaths.length > 0) {
        var path = fullPath.split('.#')[0];
        if (checkInStdFiltersArrayForm(config.datetimeAccessFormPaths, value, childName, path)) {
          return fromXmlDateTime(value);
        } else return value;
      } else return value;
    }

    function checkXmlElementsFilter(obj, childType, childName, childPath) {
      if (childType == DOMNodeTypes.ELEMENT_NODE && config.xmlElementsFilter.length > 0) {
        return checkInStdFiltersArrayForm(config.xmlElementsFilter, obj, childName, childPath);
      } else return true;
    }

    function parseDOMChildren(node, path) {
      if (node.nodeType == DOMNodeTypes.DOCUMENT_NODE) {
        var result = new Object();
        var nodeChildren = node.childNodes;
        // Alternative for firstElementChild which is not supported in some environments
        for (var cidx = 0; cidx < nodeChildren.length; cidx++) {
          var child = nodeChildren.item(cidx);
          if (child.nodeType == DOMNodeTypes.ELEMENT_NODE) {
            var childName = getNodeLocalName(child);
            result[childName] = parseDOMChildren(child, childName);
          }
        }
        return result;
      } else if (node.nodeType == DOMNodeTypes.ELEMENT_NODE) {
        var result = new Object();
        result.__cnt = 0;

        var nodeChildren = node.childNodes;

        // Children nodes
        for (var cidx = 0; cidx < nodeChildren.length; cidx++) {
          var child = nodeChildren.item(cidx); // nodeChildren[cidx];
          var childName = getNodeLocalName(child);

          if (child.nodeType != DOMNodeTypes.COMMENT_NODE) {
            var childPath = path + '.' + childName;
            if (checkXmlElementsFilter(result, child.nodeType, childName, childPath)) {
              result.__cnt++;
              if (result[childName] == null) {
                result[childName] = parseDOMChildren(child, childPath);
                toArrayAccessForm(result, childName, childPath);
              } else {
                if (result[childName] != null) {
                  if (!(result[childName] instanceof Array)) {
                    result[childName] = [result[childName]];
                    toArrayAccessForm(result, childName, childPath);
                  }
                }
                result[childName][result[childName].length] = parseDOMChildren(child, childPath);
              }
            }
          }
        }

        // Attributes
        for (var aidx = 0; aidx < node.attributes.length; aidx++) {
          var attr = node.attributes.item(aidx); // [aidx];
          result.__cnt++;
          result[config.attributePrefix + attr.name] = attr.value;
        }

        // Node namespace prefix
        var nodePrefix = getNodePrefix(node);
        if (nodePrefix != null && nodePrefix != '') {
          result.__cnt++;
          result.__prefix = nodePrefix;
        }

        if (result['#text'] != null) {
          result.__text = result['#text'];
          if (result.__text instanceof Array) {
            result.__text = result.__text.join('\n');
          }
          //if(config.escapeMode)
          //	result.__text = unescapeXmlChars(result.__text);
          if (config.stripWhitespaces) result.__text = result.__text.trim();
          delete result['#text'];
          if (config.arrayAccessForm == 'property') delete result['#text_asArray'];
          result.__text = checkFromXmlDateTimePaths(
            result.__text,
            childName,
            path + '.' + childName
          );
        }
        if (result['#cdata-section'] != null) {
          result.__cdata = result['#cdata-section'];
          delete result['#cdata-section'];
          if (config.arrayAccessForm == 'property') delete result['#cdata-section_asArray'];
        }

        if (result.__cnt == 0 && config.emptyNodeForm == 'text') {
          result = '';
        } else if (result.__cnt == 1 && result.__text != null) {
          result = result.__text;
        } else if (result.__cnt == 1 && result.__cdata != null && !config.keepCData) {
          result = result.__cdata;
        } else if (result.__cnt > 1 && result.__text != null && config.skipEmptyTextNodesForObj) {
          if ((config.stripWhitespaces && result.__text == '') || result.__text.trim() == '') {
            delete result.__text;
          }
        }
        delete result.__cnt;

        if (config.enableToStringFunc && (result.__text != null || result.__cdata != null)) {
          result.toString = function() {
            return (
              (this.__text != null ? this.__text : '') + (this.__cdata != null ? this.__cdata : '')
            );
          };
        }

        return result;
      } else if (
        node.nodeType == DOMNodeTypes.TEXT_NODE ||
        node.nodeType == DOMNodeTypes.CDATA_SECTION_NODE
      ) {
        return node.nodeValue;
      }
    }

    function startTag(jsonObj, element, attrList, closed) {
      var resultStr =
        '<' + (jsonObj != null && jsonObj.__prefix != null ? jsonObj.__prefix + ':' : '') + element;
      if (attrList != null) {
        for (var aidx = 0; aidx < attrList.length; aidx++) {
          var attrName = attrList[aidx];
          var attrVal = jsonObj[attrName];
          if (config.escapeMode) attrVal = escapeXmlChars(attrVal);
          resultStr += ' ' + attrName.substr(config.attributePrefix.length) + '=';
          if (config.useDoubleQuotes) resultStr += '"' + attrVal + '"';
          else resultStr += "'" + attrVal + "'";
        }
      }
      if (!closed) resultStr += '>';
      else resultStr += '/>';
      return resultStr;
    }

    function endTag(jsonObj, elementName) {
      return '</' + (jsonObj.__prefix != null ? jsonObj.__prefix + ':' : '') + elementName + '>';
    }

    function endsWith(str, suffix) {
      return str.indexOf(suffix, str.length - suffix.length) !== -1;
    }

    function jsonXmlSpecialElem(jsonObj, jsonObjField) {
      if (
        (config.arrayAccessForm == 'property' && endsWith(jsonObjField.toString(), '_asArray')) ||
        jsonObjField.toString().indexOf(config.attributePrefix) == 0 ||
        jsonObjField.toString().indexOf('__') == 0 ||
        jsonObj[jsonObjField] instanceof Function
      )
        return true;
      else return false;
    }

    function jsonXmlElemCount(jsonObj) {
      var elementsCnt = 0;
      if (jsonObj instanceof Object) {
        for (var it in jsonObj) {
          if (jsonXmlSpecialElem(jsonObj, it)) continue;
          elementsCnt++;
        }
      }
      return elementsCnt;
    }

    function checkJsonObjPropertiesFilter(jsonObj, propertyName, jsonObjPath) {
      return (
        config.jsonPropertiesFilter.length == 0 ||
        jsonObjPath == '' ||
        checkInStdFiltersArrayForm(config.jsonPropertiesFilter, jsonObj, propertyName, jsonObjPath)
      );
    }

    function parseJSONAttributes(jsonObj) {
      var attrList = [];
      if (jsonObj instanceof Object) {
        for (var ait in jsonObj) {
          if (
            ait.toString().indexOf('__') == -1 &&
            ait.toString().indexOf(config.attributePrefix) == 0
          ) {
            attrList.push(ait);
          }
        }
      }
      return attrList;
    }

    function parseJSONTextAttrs(jsonTxtObj) {
      var result = '';

      if (jsonTxtObj.__cdata != null) {
        result += '<![CDATA[' + jsonTxtObj.__cdata + ']]>';
      }

      if (jsonTxtObj.__text != null) {
        if (config.escapeMode) result += escapeXmlChars(jsonTxtObj.__text);
        else result += jsonTxtObj.__text;
      }
      return result;
    }

    function parseJSONTextObject(jsonTxtObj) {
      var result = '';

      if (jsonTxtObj instanceof Object) {
        result += parseJSONTextAttrs(jsonTxtObj);
      } else if (jsonTxtObj != null) {
        if (config.escapeMode) result += escapeXmlChars(jsonTxtObj);
        else result += jsonTxtObj;
      }

      return result;
    }

    function getJsonPropertyPath(jsonObjPath, jsonPropName) {
      if (jsonObjPath === '') {
        return jsonPropName;
      } else return jsonObjPath + '.' + jsonPropName;
    }

    function parseJSONArray(jsonArrRoot, jsonArrObj, attrList, jsonObjPath) {
      var result = '';
      if (jsonArrRoot.length == 0) {
        result += startTag(jsonArrRoot, jsonArrObj, attrList, true);
      } else {
        for (var arIdx = 0; arIdx < jsonArrRoot.length; arIdx++) {
          result += startTag(
            jsonArrRoot[arIdx],
            jsonArrObj,
            parseJSONAttributes(jsonArrRoot[arIdx]),
            false
          );
          result += parseJSONObject(
            jsonArrRoot[arIdx],
            getJsonPropertyPath(jsonObjPath, jsonArrObj)
          );
          result += endTag(jsonArrRoot[arIdx], jsonArrObj);
        }
      }
      return result;
    }

    function parseJSONObject(jsonObj, jsonObjPath) {
      var result = '';

      var elementsCnt = jsonXmlElemCount(jsonObj);

      if (elementsCnt > 0) {
        for (var it in jsonObj) {
          if (
            jsonXmlSpecialElem(jsonObj, it) ||
            (jsonObjPath != '' &&
              !checkJsonObjPropertiesFilter(jsonObj, it, getJsonPropertyPath(jsonObjPath, it)))
          )
            continue;

          var subObj = jsonObj[it];

          var attrList = parseJSONAttributes(subObj);

          if (subObj == null || subObj == undefined) {
            result += startTag(subObj, it, attrList, true);
          } else if (subObj instanceof Object) {
            if (subObj instanceof Array) {
              result += parseJSONArray(subObj, it, attrList, jsonObjPath);
            } else if (subObj instanceof Date) {
              result += startTag(subObj, it, attrList, false);
              result += subObj.toISOString();
              result += endTag(subObj, it);
            } else {
              var subObjElementsCnt = jsonXmlElemCount(subObj);
              if (subObjElementsCnt > 0 || subObj.__text != null || subObj.__cdata != null) {
                result += startTag(subObj, it, attrList, false);
                result += parseJSONObject(subObj, getJsonPropertyPath(jsonObjPath, it));
                result += endTag(subObj, it);
              } else {
                result += startTag(subObj, it, attrList, true);
              }
            }
          } else {
            result += startTag(subObj, it, attrList, false);
            result += parseJSONTextObject(subObj);
            result += endTag(subObj, it);
          }
        }
      }
      result += parseJSONTextObject(jsonObj);

      return result;
    }

    this.parseXmlString = function(xmlDocStr) {
      var isIEParser = window.ActiveXObject || 'ActiveXObject' in window;
      if (xmlDocStr === undefined) {
        return null;
      }
      var xmlDoc;
      if (window.DOMParser) {
        var parser = new window.DOMParser();
        var parsererrorNS = null;
        // IE9+ now is here
        if (!isIEParser) {
          try {
            parsererrorNS = parser
              .parseFromString('INVALID', 'text/xml')
              .getElementsByTagName('parsererror')[0].namespaceURI;
          } catch (err) {
            parsererrorNS = null;
          }
        }
        try {
          xmlDoc = parser.parseFromString(xmlDocStr, 'text/xml');
          if (
            parsererrorNS != null &&
            xmlDoc.getElementsByTagNameNS(parsererrorNS, 'parsererror').length > 0
          ) {
            //throw new Error('Error parsing XML: '+xmlDocStr);
            xmlDoc = null;
          }
        } catch (err) {
          xmlDoc = null;
        }
      } else if (window.ActiveXObject) {
        // IE :(
        if (xmlDocStr.indexOf('<?') == 0) {
          xmlDocStr = xmlDocStr.substr(xmlDocStr.indexOf('?>') + 2);
        }
        xmlDoc = new window.ActiveXObject('Microsoft.XMLDOM');
        xmlDoc.async = 'false';
        xmlDoc.loadXML(xmlDocStr);
      }
      return xmlDoc;
    };

    this.asArray = function(prop) {
      if (prop === undefined || prop == null) return [];
      else if (prop instanceof Array) return prop;
      else return [prop];
    };

    this.toXmlDateTime = function(dt) {
      if (dt instanceof Date) return dt.toISOString();
      else if (typeof dt === 'number') return new Date(dt).toISOString();
      else return null;
    };

    this.asDateTime = function(prop) {
      if (typeof prop == 'string') {
        return fromXmlDateTime(prop);
      } else return prop;
    };

    this.xml2json = function(xmlDoc) {
      return parseDOMChildren(xmlDoc);
    };

    this.xml_str2json = function(xmlDocStr) {
      var xmlDoc = this.parseXmlString(xmlDocStr);
      if (xmlDoc != null) return this.xml2json(xmlDoc);
      else return null;
    };

    this.json2xml_str = function(jsonObj) {
      return parseJSONObject(jsonObj, '');
    };

    this.json2xml = function(jsonObj) {
      var xmlDocStr = this.json2xml_str(jsonObj);
      return this.parseXmlString(xmlDocStr);
    };

    this.getVersion = function() {
      return VERSION;
    };
  }
}
